Soaking the super-rich

Jim Surowiecki of the New Yorker puts on the table a question I've raised here for some time, that of the top marginal tax rate for very high-income Americans. He writes:

Even within the top one per cent, income is getting more concentrated: the top 0.1 per cent of earners have seen their share of national income triple over the same period. All by themselves, they now earn as much as the bottom hundred and twenty million people. So at the same time that the rich have been pulling away from...